The stitch regulator is made for longarms on a frame. It is a rectangular type device I believe that you adjust for making your FMQ stitiches even. The only regular/domestic sewing machine that I am aware of that has this feature is Bernina. The stitch regulators are machine specific and start at about $500. Many people love them and many have bought them and don't like using them. Check for more topics on the board as it has been discussed quite a bit. Try the search feature and see what comes up to help you understand this better.